ENGER, W. (1974). Design Manual: Soil mechanics, foundations, and Earth structures. Nfec.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रENGER, W.M. Design Manual: Soil Mechanics, Foundations, and Earth Structures. Nfec, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रENGER, W.M. Design Manual: Soil Mechanics, Foundations, and Earth Structures. Nfec, 1974.
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